Don't destroy all the renderers when a multi-column block stops being multi-column (and vice versa). We make the logic for this share with the old multi-column code so that the two are closer in line.
Created attachment 222153 [details] Patch
Attachment 222153 [details] did not pass style-queue: ERROR: Source/WebCore/rendering/RenderBlockFlow.h:435: Weird number of spaces at line-start. Are you using a 4-space indent? [whitespace/indent] [3] Total errors found: 1 in 10 files If any of these errors are false positives, please file a bug against check-webkit-style.
Landed in r162726.